Fix build-vsix: create dist/ directory before VSIX packaging

[Copilot]

The build-vsix workflow was failing because vsce package writes output to ../dist/ (relative to vscode-extension/), but that directory doesn't exist in a fresh checkout.

Change

Added a mkdir -p dist step before the "Package VSIX" step in .github/workflows/build-vsix.yml:

- name: Create dist directory
  run: mkdir -p dist

- name: Package VSIX
  working-directory: vscode-extension
  run: npx @vscode/vsce package ... --out "../dist/agentsec-${VERSION}.vsix"

Original prompt

Fix the failing GitHub Actions workflow build-vsix
Analyze the workflow logs, identify the root cause of the failure, and implement a fix.
Job ID: 69411599315
Job URL: https://github.com/alxayo/sec-check/actions/runs/23814880975/job/69411599315